This puzzle is based on and inspired by the What is a Word™ series started by JLee that have grown into Word™, Phrase™, and Number™ puzzles.
If a word conforms to a certain rule, I call it a Watchful Word™.
This is a list of Watchful Words™ and Not Watchful Words™.
| Watchful Word™ | Not Watchful Word™ |
|---|---|
| Sinovac | Phizer |
| Paprika | Pepper |
| Mayonnaise | Mustard |
| Smart | Stupid |
| Horsepower | Watts |
| Nocturnal | Diurnal |
| Daughter | Son |
| Junior | Senior |
| Azerbaijan | Georgia |
| Lifeboat | Barge |
| Decrease | Increase |
CSV:
Watchful Word™, Not Watchful Word™ Sinovac, Phizer Paprika, Pepper Mayonnaise, Mustard Smart, Stupid Horsepower, Watts Nocturnal, Diurnal Daughter, Son Junior, Senior Azerbaijan, Georgia Lifeboat, Barge Decrease, Increase Hint:
The seventh is missing.